63 lines
1.8 KiB
Go
63 lines
1.8 KiB
Go
// Copyright 2014 Docker, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Code forked from Docker project
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package daemon
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import (
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"net"
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"os"
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)
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// SdNotify sends a message to the init daemon. It is common to ignore the error.
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// If `unsetEnvironment` is true, the environment variable `NOTIFY_SOCKET`
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// will be unconditionally unset.
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//
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// It returns one of the following:
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// (false, nil) - notification not supported (i.e. NOTIFY_SOCKET is unset)
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// (false, err) - notification supported, but failure happened (e.g. error connecting to NOTIFY_SOCKET or while sending data)
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// (true, nil) - notification supported, data has been sent
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func SdNotify(unsetEnvironment bool, state string) (sent bool, err error) {
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socketAddr := &net.UnixAddr{
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Name: os.Getenv("NOTIFY_SOCKET"),
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Net: "unixgram",
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}
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// NOTIFY_SOCKET not set
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if socketAddr.Name == "" {
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return false, nil
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}
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if unsetEnvironment {
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err = os.Unsetenv("NOTIFY_SOCKET")
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}
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if err != nil {
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return false, err
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}
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conn, err := net.DialUnix(socketAddr.Net, nil, socketAddr)
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// Error connecting to NOTIFY_SOCKET
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if err != nil {
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return false, err
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}
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defer conn.Close()
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_, err = conn.Write([]byte(state))
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// Error sending the message
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if err != nil {
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return false, err
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}
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return true, nil
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}
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